Dunwall City Trials—which will cost $4.99 or 400 Microsoft points—will offer up ten skill-centered tests where you'll be made to battles waves of enemies in arenas, perform drop assassinations and run through point-to-point races as fast as you can.

The other DLC will hit in 2013, but don't have prices attached yet. They'll focus on story including one that lets you play as a major character from Dishonored: (Mild spoilers for those who haven't finished the game)

Daud, the leader of a group of supernatural assassins known as ‘The Whalers', will be the focus of the second add-on pack, scheduled for release in early Spring 2013. Make your way through new Dunwall locales and discover Daud's own set of weapons, powers and gadgets in this story-driven campaign. How you play and the choices you make will impact the final outcome…